<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS</title>

    <style>
        td{
            text-align: center;
        }
        tr.down{
            color: red;
        }
        tr.del{
            color: green;
        }
        tr.nomal{
            font-weight: bold;
            color: blue;
        }
    </style>
</head>
<body>
    
    <table border="1px" width="250px" heigth="50px" cellspacing="0">
        <tr class="down">
            <td>
                <u>1</u>
            </td>
            <td>
                <u>2</u>
            </td>
            <td>
                <u>3</u>
            </td>
        </tr>
        <tr class="del">
            <td>
                <del>4</del>
            </td>
            <td>
                <del>5</del>
            </td>
            <td>
                <del>6</del>
            </td>
        </tr>
        <tr class="nomal">
            <td>7</td>
            <td>8</td>
            <td>9</td>
        </tr>

    </table>
</body>
</html>